Signal horn



C. S. KELLEY May19,`1931.

S IGNAL HORN Filed Feb. 5, 1950 INVENTOR CECH. 5. KELLEY ATTO NE Patented May 19,k 1931 UNi s'rArl-:s

oncIL s. KELLEY, or nner McxEnsron-T, PENNSYLVANIA, AssreNonro THE wnsTING- HOUSE are BRAKE COMPANY, or w1LMEnnING,:1 nNNsYLvANm, A CORPORATION F PENNSYLVANIA SIGNAL .HORN y Application filed February 5, 1930. Asatin No. fiat-for?.Y

This invention relates to sound producers, and more particularly to a sound producer of the type employing a flexible diaphragm which is caused to vibrate by the action of pulsating air pressure to which the diaphragm Vis subject.

One object of the invention is to provide Va iuid pressure operatedy sound producer of the diaphragm type, inV which the vibratory movement of the .diaphragm is positive and certain.

Another object of the invention is to pro vide a sound producing device having chambers adapted to be Ysupplied with fluid under pressure for causing a. flexible sound producing member to vibrate, in'which means are provided for limiting the vibration of the flexible member in both directions.

Another object of the invention is to pro- '20 vide a sound producing device which is sim* ple and compact in construction and one which will be efficient for the purpose intended.

In the accompanying drawing, the single ligure is a central sectional view of a sound producing device constructed in accordance with my invention.

As shown in the drawing,fthe device comprises a casing `1 having a chamber 2 and a central tube 4 that yextends outwardly with a horn 5 mounted therein. Mounted to engage the annular face 6 of the tube is a flexible diaphragm 7 adapted to be held in position by a cap or cover 8.

According yto my invention the capl or cover 8 is provided with a central ,cavity or chamber 9 which is adjacent-to one side of the eXible diaphragm. A circular chamber 10 is provided in the innerrface of the cap 8 and around the central chamber 9. A port 11 in the cap connects chamber 10 to the at ymosphere. rlhe numeral 12 indicates an .annular shoulder adapted to'be engagedfby ,45 the flexible diaphragm on outward movement y ofsame. Y

Secured to the central portion of the diaphragm 7 and extendinglintothe open end of the tube 4 is a weight 13. Apassage 14 in the casing 1 registers with a passage 15 in the cap 8, said passage l'openiing into chamber 9 through :afr'estricted port '16. r-'The''chamber `2 is v'connected' with la pipe 17, through`- la restricted port V18, whereby Enid under pressure is supplied to said chamer. :In operation, the luid'underpressure enterstlre h'orn through pipe 17 vinto kchambers 2 .and 9. The fluid under pressure xrchamber 9 'flowswfreely past the :diaphragm stopfin chamber 10 fandfout through atmospheric ven-t 11S.. rThe pressure 'in 'chamber 2 'fbuilds up slightly, iio'rcingl the diaphragm against its stop, 'thus permitting the pressure in chamber '2 Sto exhaust'through vent tube :4, f but tending to trap and' permit the pressureto build up in chamber 9, fsaid y chamber being closed kto atmospheric vent '11'by engagement othediaphragmLY withl'fstop 11i.. rlllhus the diaphragm istorcedghack 'to `its origin-'al position and is ready to.'r,epeat the cycle. In .this way the diaphragm action is made positive in both. directions instead olff trusting toits perfectionr of' 'material 'shapefand location to return it fcorrectly. Y The .vibration yof diaphragm Z produces a sound 'which amplified throughfthe hornv 5 andthe Ymildition of the weighted member 13 to the diaphragm 7 makes it necessary for the fluid pressure to build up to a higher point before the diaphragm will move from engagement with the end of the vent tube 6, than would be the case withV a weightless dia- Y embodiment or otherwise than by the terms of the appended claims. Y

Having now describedmy invention, what I claim as new and desire to secure by Letand subject to'luid pressure in chambers Aat opposite sides of the diaphragm, and

means for supplying fluid under pressure to said chambers.

2. A sound producing device comprising a casing, a diaphragm mounted in said casing and subject to fluid pressure in chambers at opposite sides of the diaphragm fluid under pressure being supplied to one chamber through a restricted port and to the other chamber through another restricted port.

3. A sound producing device comprising a casing, a flexible diaphragm mounted in said casing, a fluid pressure chamber open to one rside of the diaphragm, a fluid pressure chamber open to the other side of the diaphragm and to an atmospheric vent port, the movement of the diaphragm in one direction operating to restrict communication from the second chamber to the vent port.

4. A sound producing device comprising a casing, a flexible diaphragm mounted in said casing, a Huid pressure chamber open to one side of the diaphragm, the movement of the diaphragm in one direction operating to connect said chamber With the atmosphere, a fluid pressure chamber open to the opposite side of the diaphragm and to an atmospheric vent port, the movement of the diaphragm in one direction operating to restrict communication from the second chamber to said e vent port.

5. A sound producing device comprising a casing, a diaphragm mounted in said casing and subject to fluid pressure in chambers at opposite sides of the diaphragm, means for supplying fluid under pressure to said chambers and the movement of said diaphra alternately controlling the increase and grease of the pressure of fluid acting on opposite sides of the diaphragm.

In testimony whereof I have hereunto set my hand, this 3rd day of February, 1930.

CECIL S. KELLEY. 

